Twyer



June Y3, 1930. l w G, CRQTHERS 1,761,182

TWYER Filed May 29', 1928 `Patented June 3, 1930 j UNITED. STATES WLLIAM G. oRo'rHnRs, on OAKFIELD, NEW Yom;

TWYER Application filed May 29,

This invention relates to twyers and more particularly to a twyer construction especially adapted for use in furnaces of the type illustrated in my prior application, Serial No. 286,560, iiledNovember 29, 1927,

Vfor Furnaces, and in the patent'to J. F. O.

Stratton, N o. 1,505,505, granted August 19, 1924.

An important object ofthe invention is to provide a twyer for use infurnaces of this type of such character that it will not be destroyed bythe slag deposits to which such furnaces are subject.

A further object of the invention is to provide a twyer for use inlfurnaces employing pulverized fuel which is delivered into the furnace in a blast of such character that the blast from the twyer serves to hold the fuel from the grate until it has been completely consumed.

A further object of the invention is to provide a twyer of such construction that the air blast is continually operative as a cooling medium for the twyer, so that its destruction by subjection to intense heat is prevented, whether the dampers controlling the twyer are closed or not.

A still further object ofthe invention is to provide a twyer construction havinginternal dampers controlling the flow of air 20 to engage overthe 11anges23.` The, `bills l therefrom, so that the airis constantly present in the twyer and serves to cool the same and prevent its destruction by heat.

1928. Serial No. 281,579.

is arrangedV a grate 12.` Thev numeral 13 designates a support for the lower endyof Vvthe baille wall to which, in accordance with my invention, Il secure an elongated hollow. body 14, the junction of the inner. face 15 of which with the upperand lower walls is formed with a series of notches 16jforming air outlets. Thisstructure isshapedrsimilarly to the opening which is ordinarily rec-ly tangular Vand feach side thereof has the'opening 16 of its upper and lower edges controlled by independently movable dampers 17 and 18.r Air is supplied to the interior of the body 14 by a supply pipe 19 connected with the discharge of a blower (not herein shown). `1 The bottom'wall 20. ofV the twyer body '141 is spaced aboveithe uppersurface'of thegrate 12 andinas securedthereto a support 21 havingv aliat lower face 22 andan outwardly directed flange 28 at its lower end. Grate elements or what mighty 4be 4termedsifter grates lare provided comprisving barsv 24;, the inner ends of which are of ,amdepth substantially equal to the distance .between the lower wall 20 of the twyer body and the adjacent face of the grate, These liars have a rearward. extension 25, the Yrear .ends of which are'reverted to form-`hooks 'of' these hooks andthe flanges are perforated for` the reception of securing elements -27 which may be simply dropped into place l These and other objects I attain by the inthe openings toprevent dislodgment ofg.,

construction shown in the accompanying drawing, wherein forthe purpose of illustration is shown a preferred embodiment of my invention and whereinr Figure 1 is a sectional view through a furnace: embodying .twyers constructed in` accordance with my invention;

Figure 2 is an enlarged detail sectional view through one side of the-twyer structure,

the bars. Thek adjacent facesof the wide portions have lugs which maintain thelsame 'in slightlyv spacedrr'elation vand spacing of the extensions is, VofA course, maintained by `the securing ,ele1nents,2 7. j Y

, It willfbe obvious that :the constant presence lof air fromthefblower in thetwyer' body will cool the same` and prevent destructionby slagfwhich,` during the operation of the dampers beingillustrated in solid lines affurnaceof this character, passes containy n in the position which vthey occupy during ,uallydown the baille. 10 and over theffac'e 95 normal operation of the furnace.

Referring now more particularly to the i f drawing, the numeral 10 generally desig- 4 `nates a downwardly inclining baille wall 'de-` ofthe Vopening whichjvtends to' maintainrv jof thetwyer. The'air blast from the open- "ture 'forms a turbulent zone about the Vlefvfel klining a central opening 11 beneath which powdered 'fuel'insuspensin in'V the air until 10o it has been completely consumed, while the blast from the lower openings tends to complete trlie burning of any partially burned particles which may fall from the grate. The blast from the openings 1S will, during the greater portion of the operation of the furnace, be very slight and only sufficient to provide a burning draft without forced draft characteristics.

The grate 12 will not be overheated and there will be no tendency to the accumulation of pressure beneath the ygrate and within the ash pit. The independent controls 17, 18 of the dampers 17 and 18 may be operated in any suitable manner but will, of course, be made accessible from the exterior lof the furnace in which the twyers are disposed.

Since the construction hereinbefore set yforth is capable4 of acertain range of change and modification without materially departing from the spirit of the invention, I do not limit myself to such specific structure except as hereinafter claimed.

1. A twyer for furnaces of the character described comprising a hollow body having at the upper andy lower edges of its inner faceseries `of openings, means for constantly supplying air to the interior of the body and mounted on the inner wall thereof and independent dempers withinv the body for controlling the discharge of air through each series of said openings. l Y

3.'In afurnace, a downwardly and centrally 'inclining baiile defining a central opening with its inner edge, a grate disposed beneath the opening and a twyer dis- ,posed between the edges of the baiiie and the grate comprising a hollow body having at the upper andlower edges of its inner face series of opemn s, means for constantlly,` supplying air-.toit erinterior of the body and mountedA on the `inner wall thereof and independent dempers within theY body @for controlling the discharge of air through each series :of said openings, 1the openings ofthe upper edgeY directing af blasty of, airv inwardly anduupwardly, thoseof the, loweredge disy `charging 'a blast of air inwardly and across thegpata 5 l .1., v 4. A twyer comprising a hollow body hav- WILLIAM G. CROTHERS. 

